Frederick William Mallalieu (1860 – 10 May 1932) was a Liberal Party politician in the United Kingdom. Son of woollen manufacturer and ironworks company chairman Henry Mallalieu (1831-1902), J.P., of Delph Lodge, Delph, Saddleworth, near Oldham, (now Greater Manchester, then in the West Riding of Yorkshire) Mallalieu was educated at Huddersfield College, Henry Mallalieu was of humble origins, one of nineteen children of weaver Joseph Mallalieu, and descended from Huguenots that settled at Saddleworth in the early 1600s; at the age of twelve Henry worked as a hand-loom weaver. Frederick's brother, Albert Henry Mallalieu, was head of that family of Tan-y-Marian, Llandudno.